How can you identify that the given substance is a metal or nonmetal​

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

Nonmetal halogen family atmoic mass 35

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.